Rabadon's Deathcap is a majestic, oversized wizard's hat with a tall, conical shape that tapers to a slightly curved point. The cap is adorned with intricate golden embroidery and arcane symbols that glow faintly with a magical aura. The fabric is a deep, rich purple with a velvety texture, accented by a wide, ornate golden brim that adds to its regal appearance. The interior is lined with a shimmering silver material that reflects light, giving the impression of hidden power. The hat's design is both imposing and elegant, symbolizing immense magical prowess.